<?php
/*
 ======================================================================
 lastRSS 0.9.1
 
 Simple yet powerfull PHP class to parse RSS files.
 
 by Vojtech Semecky, webmaster @ webdot . cz
 
 Latest version, features, manual and examples:
     http://lastrss.webdot.cz/
 
 ----------------------------------------------------------------------
 LICENSE
 
 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License (GPL)
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 GNU General Public License for more details.
 
 To read the license please visit http://www.gnu.org/copyleft/gpl.html
 ======================================================================
*/
 
/**
* lastRSS
* Simple yet powerfull PHP class to parse RSS files.
*/
class RSS {
    // -------------------------------------------------------------------
    // Public properties
    // -------------------------------------------------------------------
    var $default_cp = 'UTF-8';
    var $CDATA = 'nochange';
    var $cp = '';
    var $items_limit = 0;
    var $stripHTML = False;
    var $date_format = '';
 
    // -------------------------------------------------------------------
    // Private variables
    // -------------------------------------------------------------------
    var $channeltags = array ('title', 'link', 'description', 'language', 'copyright', 'managingEditor', 'webMaster', 'lastBuildDate', 'rating', 'docs');
    var $itemtags = array('title', 'link', 'description', 'author', 'category', 'comments', 'enclosure', 'guid', 'pubDate', 'source');
    var $imagetags = array('title', 'url', 'link', 'width', 'height');
    var $textinputtags = array('title', 'description', 'name', 'link');
 	
    public static function Parse($url){
    	$rss = new RSS();
    	return $rss->to_parse($url);
    }
    
    
    // -------------------------------------------------------------------
    // Modification of preg_match(); return trimed field with index 1
    // from 'classic' preg_match() array output
    // -------------------------------------------------------------------
    function my_preg_match ($pattern, $subject) {
        // start regullar expression
        preg_match($pattern, $subject, $out);
 
        // if there is some result... process it and return it
        if(isset($out[1])) {
            // Process CDATA (if present)
            if ($this->CDATA == 'content') { // Get CDATA content (without CDATA tag)
                $out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
            } elseif ($this->CDATA == 'strip') { // Strip CDATA
                $out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
            }
 
            // If code page is set convert character encoding to required
            if ($this->cp != '')
                //$out[1] = $this->MyConvertEncoding($this->rsscp, $this->cp, $out[1]);
                $out[1] = iconv($this->rsscp, $this->cp.'//TRANSLIT', $out[1]);
            // Return result
            return trim($out[1]);
        } else {
        // if there is NO result, return empty string
            return '';
        }
    }
 
    // -------------------------------------------------------------------
    // Replace HTML entities &something; by real characters
    // -------------------------------------------------------------------
    function unhtmlentities ($string) {
        // Get HTML entities table
        $trans_tbl = get_html_translation_table (HTML_ENTITIES, ENT_QUOTES);
        // Flip keys<==>values
        $trans_tbl = array_flip ($trans_tbl);
        // Add support for &apos; entity (missing in HTML_ENTITIES)
        $trans_tbl += array('&apos;' => "'");
        // Replace entities by values
        return strtr ($string, $trans_tbl);
    }
 
    // -------------------------------------------------------------------
    // Parse() is private method used by Get() to load and parse RSS file.
    // Don't use Parse() in your scripts - use Get($rss_file) instead.
    // -------------------------------------------------------------------
    function to_parse ($rss_url) {
        // Open and load RSS file
        if ($f = @fopen($rss_url, 'r')) {
            $rss_content = '';
            while (!feof($f)) {
                $rss_content .= fgets($f, 4096);
            }
            fclose($f);
 
            // Parse document encoding
            $result['encoding'] = $this->my_preg_match("'encoding=[\'\"](.*?)[\'\"]'si", $rss_content);
            // if document codepage is specified, use it
            if ($result['encoding'] != ''){
            	$this->rsscp = $result['encoding'];
            	$rss_content = iconv($this->rsscp, 'utf-8', $rss_content);
            }
            // otherwise use the default codepage
            else
                { $this->rsscp = $this->default_cp; } // This is used in my_preg_match()
 
            // Parse CHANNEL info
            preg_match("'<channel.*?>(.*?)</channel>'si", $rss_content, $out_channel);
            foreach($this->channeltags as $channeltag)
            {
                $temp = $this->my_preg_match("'<$channeltag.*?>(.*?)</$channeltag>'si", $out_channel[1]);
                if ($temp != '') $result[$channeltag] = $temp; // Set only if not empty
            }
            // If date_format is specified and lastBuildDate is valid
            if ($this->date_format != '' && ($timestamp = strtotime($result['lastBuildDate'])) !==-1) {
                        // convert lastBuildDate to specified date format
                        $result['lastBuildDate'] = date($this->date_format, $timestamp);
            }
 
            // Parse TEXTINPUT info
            preg_match("'<textinput(|[^>]*[^/])>(.*?)</textinput>'si", $rss_content, $out_textinfo);
                // This a little strange regexp means:
                // Look for tag <textinput> with or without any attributes, but skip truncated version <textinput /> (it's not beggining tag)
            if (isset($out_textinfo[2])) {
                foreach($this->textinputtags as $textinputtag) {
                    $temp = $this->my_preg_match("'<$textinputtag.*?>(.*?)</$textinputtag>'si", $out_textinfo[2]);
                    if ($temp != '') $result['textinput_'.$textinputtag] = $temp; // Set only if not empty
                }
            }
            // Parse IMAGE info
            preg_match("'<image.*?>(.*?)</image>'si", $rss_content, $out_imageinfo);
            if (isset($out_imageinfo[1])) {
                foreach($this->imagetags as $imagetag) {
                    $temp = $this->my_preg_match("'<$imagetag.*?>(.*?)</$imagetag>'si", $out_imageinfo[1]);
                    if ($temp != '') $result['image_'.$imagetag] = $temp; // Set only if not empty
                }
            }
            // Parse ITEMS
            preg_match_all("'<item(| .*?)>(.*?)</item>'si", $rss_content, $items);
            $rss_items = $items[2];
            $i = 0;
            $result['items'] = array(); // create array even if there are no items
            foreach($rss_items as $rss_item) {
                // If number of items is lower then limit: Parse one item
                if ($i < $this->items_limit || $this->items_limit == 0) {
                    foreach($this->itemtags as $itemtag) {
                        $temp = $this->my_preg_match("'<$itemtag.*?>(.*?)</$itemtag>'si", $rss_item);
                        if ($temp != '') $result['items'][$i][$itemtag] = $temp; // Set only if not empty
                    }
                    // Strip HTML tags and other bullshit from DESCRIPTION
                    if ($this->stripHTML && $result['items'][$i]['description'])
                        $result['items'][$i]['description'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['description'])));
                    // Strip HTML tags and other bullshit from TITLE
                    if ($this->stripHTML && $result['items'][$i]['title'])
                        $result['items'][$i]['title'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['title'])));
                    // If date_format is specified and pubDate is valid
                    if ($this->date_format != '' && ($timestamp = strtotime($result['items'][$i]['pubDate'])) !==-1) {
                        // convert pubDate to specified date format
                        $result['items'][$i]['pubDate'] = date($this->date_format, $timestamp);
                    }
                    // Item counter
                    $i++;
                }
            }
 
            $result['items_count'] = $i;
            return $result;
        }
        else // Error in opening return False
        {
            return False;
        }
    }
}